Crankpin replacement bearing construction



Feb- 8, 1949 l .1,w-l-1EAsToNA 2,461,273

CRANKPIN REPLACEMENT BEARING CONSTRUCTIONy Filed Jan. so, 1945 /5 zz 5 .5d 4

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Patented Feb. 8, 1:949

UNITED A `s.'lfiA'rias PAT am ,or Flic-E CRANK'PIN REPLACEMEN BEARING .CONSTRUCTION .191m vv.rieli sto,namingtenpeach. Calif. Application-.January 30, 1945, Serial N0.'5'75,302

,This invention relates to machine. elementsand more particularly to replacement crank pins designed to be. set in Worn crank pin bearings.

In certain types ofmachines such, for example, as oil pumps, the crank arms become badly worn in the pin bearings, so that the installation of a new crank pin of the same type as the removed worn one, is not feasible since a snug lit of the pin in the crank opening could not be obtained.

The present invention has for its object to provideia replacement pin unit which can be in stalled in such worn crank arm opening with suitable metal babbitted in to form an integral connection between the pin and the crank arm which it couples together.

Another object of the present invention is to provide a replacement crank pin for the purpose stated in which securing nuts, threaded upon the ends of the pin to maintain the pin in place, are formed in a novel manner to facilitate pouring bearing metal in around the pin after it has'been set in the work crank arm openings.

The invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawing forminga part of the speccation, with the understanding, however, that the invention is not confined to a strict conformity with the showing of the drawing but may be changed or modifled, vso long as such changes or modifications mark no material departure from the salient feathe diameter of the pin I4,'and has fastened-on tures of the'inventionas expressed in the appended claims.

.m the. drawing:

Figure 1 illustrates the application of thev invention tothe crank arm and pitrnan of' an oil Dump- Figure 2 is a section taken on line 2-2 of Figure 1.

Figure 3 is a section taken on line 3-3 of Figure 1.

Figure 4 is a section taken on line 4-4 of Figure 1.

Figure 5 is a fragmentary section taken on line 5 5 of Figure 1.

Figure 6 is a View in perspective of the bearing sleeve encircling the pin.

Referring now more particularly to the drawing the numerals I0 and II designate, respectively, the pitman and crank arm of an oil pump in connection with which the present invention is particularly designed for use, although it is to be understood that it is not to be conned to such use, but may be used wherever it is found applicable.

one end the collar I8, while spaced alined openings I9' are formed through the sleeve fonpurposes presently to appear.

The numerals 2|)A andA 2| designate nuts toghe threaded upon the ends I5 and I'5al of the `pin and' the nut2I has a channel out in itsv inner-'face from the outside thereof as indicated at 22g while the face of the nut 2t is hollow ground; as indi'- catedat23.

The outer face of the collar I8, together with the end of the sleeveA adjacent thereto; isf also hollowl ground as,r indicated VVat 24,.' and'v these ground outl faces 23 and 24= are inA opposition but separated by the c-rank arm II, being locatedf respectively on opposite sides of such armrwith the hollowground(A facesv each 'opposing ai .facer-of the arm, when the pinfis installed. forthe vpurpose hereinafter set' forth. The collar If8 has afsiot or ,channel 25 in the hollow ground faceathereof adjacent its outer-edge. Y

In setting up the pin` forI use; the: portion of; pin having `theencircling channels t6 I thereihgfis inserted into-the 'collar end-f of the sleeve? to thev point where;V when the"l sleeve is introduced into the lnearin'g` opening I2: offth'e vpitmani Iii Aanti-"the nut 20` applied to :the 'pini vthe nut.' wheiifdrwn up will be tight or snug against the end of the sleeve and the collar is thus brought in alinement with the crank arm as it is shown in Figure 1.

The outer surface of the sleeve acts as a bearing for the pin in the pitman bearing opening.

When the sleeve is so positioned on the pin, with the nut 20 threaded on the end I5 of the pin into engagement with the sleeve Il, molten metal 26 is poured into the sleeve through the openings I9, so that all of the space between the pin and sleeve is uniformly Iilled. This metal forms ribs 21 within the channels I 6, and these, together with the part of the metal which lls the openings I9 as indicated at 28, lock the sleeve against K' endwise movement on the pin and provide a rigid structure. After the filling metal has set, the nut 201s removed and the sleeve and pin, which together may generally be defined as the bearing pin, are then inserted into the opening I2 of the pitman l0, and the nut 20 is re-applied and drawn up tight against the end of the pin and the pitman, as shown.

The crank arm Il is then put into place on the end l5a of the pin which remains extending beyond the collar I8. The side of the crank arm is brought to bear against the hollow ground face 24 of the collar and the nut 2l is then threaded onto the pin end I5a, and the hollow ground face of this nut is tightened up against the outer side of the crank arm. y y

Molten metal 3D is poured into the space between the wall of the opening I3 of the crank arm, and the pin I4, through the channel 2270i the nut 2|, and also through the channel 25 of the collar I8. This causes the spaces between the hollow ground faces of the nut and collar to be iilled, together with the worn opening I3 external of the pin. Thus the end of the pin I 4, beyond the collar, and the crank arm, together with sleeve I'i, are tightly bonded together so that as the arms move the coupling pin and the crank arrn turn together. It will be understood that the molten metal forms a bond between the pin i4, crank arm H, nut 2l and the sleeve Il, to produce a unitary structure with only the pitman having movement relatively to all of the foregoing elements. As will be understood, should tightness be present between the pitman and the collar I8 and nut 20 suflicient to prevent relative movement between the pitman and sleeve I'l suitable iioating washers (not shown) may be interposed between the pitman and the collar and nut in a well-known manner.

From the foregoing it will be readily apparent that the present invention provides a simple, efcient bearing pin for a replacement when the regular bearing pin and the bearing openings in the crank arms of a pump or similar device become worn beyond further usefulness, such replacement being easy to install and maintaining the arms in proper and accurateY working relation.

I claim:

1. In means for restoring the operative relationship between a pitman and its co-operating crank arm and crank pin ensemble in presence ofA worn conditions within the ensemble, the combination with the pitman and crank arm, of an assemblage operative to function as a crankpin having a rigid connection with the crank arm and rotatable relative to the pitman, said assem- 5 less than that of the respective openings and with the end zones of the member extending beyond the crank arm and pitman openings and threaded for receiving nuts for retaining the ensemble in operative relation, and an annular element carried by and anchored to the member and freely rotatable Within and relative to the pitman, an end zone of the element having a collar constituting a spacing member for the pitman and crank-arm, said crank arm nut and said collar each being formed to permit location of an anchoring medium of fusible type between the nut, collar, elongated member and the crank arm to thereby anchor the crank arm to said elongated member.

2. An assemblage as in claim 1 characterized in that the faces of nut and collar co-operating with the crank arm are each hollow-ground, and formed with an opening leading from an external face to such face to thereby permit ready access of theV anchoring medium in fusible form 'tov the space between the elongated member and wall of the Worn opening of the crank arm and such hollow-ground faces with the solidified medium providing a looking-key between'the crank arm, the nut, the collar and the elongated member.

3. An assemblage as in claim 1 characterized in that the internal diameter of thel element is greater than the external diameter` of the elongated member with the element including radial openings to receive the fusible anchoring means and to provide the means in solidified form as an anchoring formation between the member and element. f

4. An assemblage as in claim 1 characterized in that the internal diameter of the element is greater than the external diameter of the elongated member with Vthe latter peripherally grooved and with the element including radial openings registering withy the grooves to receive the fusible anchoring means and to provide the means in solidified form as an anchoring formation between the member and the element and operative to prevent endwise movement of the element on the member.

JOHN W. HEASTON.

REFERENCES CITED The foliowingreferences are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 656,718 Fletcher 1 Aug. 28, 1900 1,498,769 Wood June 24, 1924 1,549,218 Raym Aug. 1l, 1925 1,589,004 Stone June 15,1926 

